1. areas that are surrounded by a fence, wall, or other barrier
2. documents or items included with a letter or package
3. the act of surrounding or closing off an area

Examples

• The zoo has several large enclosures for the elephants.
• Please find the contract and receipt as enclosures with this letter.
• The dog park has separate enclosures for large and small breeds.
• The email mentioned three enclosures, but I only received two documents.
• Medieval castles often had multiple enclosures for defense.
• The farmer built new enclosures to keep the sheep safe from predators.
• Check the enclosures carefully before signing the mortgage papers.